[FFmpeg-user] filter_complex out-of-sync videos
amindfv at mailbox.org
amindfv at mailbox.org
Sat Jan 8 07:20:12 EET 2022
On Fri, Jan 07, 2022 at 12:54:06AM -0800, amindfv--- via ffmpeg-user wrote:
> OS: Debian 11.2, latest ffmpeg git master.
>
> I've got a fairly simple filtergraph that's been giving me quite a hard time in terms of starting or staying in sync. I've boiled it down to a test case with three input videos, two identical (i.e. the same file), which clearly shows at least a frame of difference: the alpha channel appears to change at least a frame before the video channel whose input is the same. This leaves very weird ghosting anytime there's significant motion in the source video.
>
> What's going on here? Do I need to force synchronization myself? Is something else happening?
Should I provide sample video files to demonstrate the issue?
> Thanks,
> Tom
>
> Full uncut console output:
>
> $ ./ffmpeg -i <vid1.mp4> -i <vid2.mp4> -i <vid2.mp4> -filter_complex '[1:v]extractplanes=y[A], [0:v][A]alphamerge[B], [2:v][B]overlay' -q 1 -t 300 alphatest.mp4
> ffmpeg version N-105195-g242ed971cb Copyright (c) 2000-2022 the FFmpeg developers
> built with gcc 10 (Debian 10.2.1-6)
> configuration:
> libavutil 57. 18.100 / 57. 18.100
> libavcodec 59. 20.100 / 59. 20.100
> libavformat 59. 17.100 / 59. 17.100
> libavdevice 59. 5.100 / 59. 5.100
> libavfilter 8. 25.100 / 8. 25.100
> libswscale 6. 5.100 / 6. 5.100
> libswresample 4. 4.100 / 4. 4.100
> Input #0, matroska,webm, from '<vid1.mp4>':
> Metadata:
> encoder : libebml v1.3.0 + libmatroska v1.4.1
> creation_time : 2013-12-12T19:56:29.000000Z
> Duration: 01:50:01.18, start: 0.000000, bitrate: 2206 kb/s
> Stream #0:0: Video: h264 (High), yuv420p(tv, bt709/bt709/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)
> Metadata:
> title : <title>
> Stream #0:1(eng): Audio: ac3, 48000 Hz, stereo, fltp, 96 kb/s (default)
> Metadata:
> title : English Audio - <title>
> Input #1, matroska,webm, from <vid2.mp4>:
> Metadata:
> encoder : libebml v1.2.0 + libmatroska v1.1.0
> creation_time : 2011-04-25T23:32:27.000000Z
> Duration: 01:40:40.11, start: 0.000000, bitrate: 7289 kb/s
> Chapters:
> Chapter #1:0: start 0.000000, end 76.033611
> Metadata:
> title : Chapter 1
> Chapter #1:1: start 76.033611, end 326.575567
> Metadata:
> title : Chapter 2
> Chapter #1:2: start 326.575567, end 975.640656
> Metadata:
> title : Chapter 3
> Chapter #1:3: start 975.640656, end 1506.128944
> Metadata:
> title : Chapter 4
> Chapter #1:4: start 1506.128944, end 1871.368822
> Metadata:
> title : Chapter 5
> Chapter #1:5: start 1871.368822, end 2241.613689
> Metadata:
> title : Chapter 6
> Chapter #1:6: start 2241.613689, end 2731.352944
> Metadata:
> title : Chapter 7
> Chapter #1:7: start 2731.352944, end 3046.250856
> Metadata:
> title : Chapter 8
> Chapter #1:8: start 3046.250856, end 3321.609278
> Metadata:
> title : Chapter 9
> Chapter #1:9: start 3321.609278, end 3487.399900
> Metadata:
> title : Chapter 10
> Chapter #1:10: start 3487.399900, end 3803.841022
> Metadata:
> title : Chapter 11
> Chapter #1:11: start 3803.841022, end 3982.060733
> Metadata:
> title : Chapter 12
> Chapter #1:12: start 3982.060733, end 4591.919989
> Metadata:
> title : Chapter 13
> Chapter #1:13: start 4591.919989, end 4818.646489
> Metadata:
> title : Chapter 14
> Chapter #1:14: start 4818.646489, end 5397.474733
> Metadata:
> title : Chapter 15
> Chapter #1:15: start 5397.474733, end 5918.161567
> Metadata:
> title : Chapter 16
> Chapter #1:16: start 5918.161567, end 6039.491111
> Metadata:
> title : Chapter 17
> Chapter #1:17: start 6039.491111, end 6040.106000
> Metadata:
> title : Chapter 18
> Stream #1:0(eng): Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)
> Stream #1:1(eng): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
> Stream #1:2(eng): Audio: aac (LC), 48000 Hz, mono, fltp
> Stream #1:3(eng): Subtitle: subrip (default)
> Input #2, matroska,webm, from <vid2.mp4>:
> Metadata:
> encoder : libebml v1.2.0 + libmatroska v1.1.0
> creation_time : 2011-04-25T23:32:27.000000Z
> Duration: 01:40:40.11, start: 0.000000, bitrate: 7289 kb/s
> Chapters:
> Chapter #2:0: start 0.000000, end 76.033611
> Metadata:
> title : Chapter 1
> Chapter #2:1: start 76.033611, end 326.575567
> Metadata:
> title : Chapter 2
> Chapter #2:2: start 326.575567, end 975.640656
> Metadata:
> title : Chapter 3
> Chapter #2:3: start 975.640656, end 1506.128944
> Metadata:
> title : Chapter 4
> Chapter #2:4: start 1506.128944, end 1871.368822
> Metadata:
> title : Chapter 5
> Chapter #2:5: start 1871.368822, end 2241.613689
> Metadata:
> title : Chapter 6
> Chapter #2:6: start 2241.613689, end 2731.352944
> Metadata:
> title : Chapter 7
> Chapter #2:7: start 2731.352944, end 3046.250856
> Metadata:
> title : Chapter 8
> Chapter #2:8: start 3046.250856, end 3321.609278
> Metadata:
> title : Chapter 9
> Chapter #2:9: start 3321.609278, end 3487.399900
> Metadata:
> title : Chapter 10
> Chapter #2:10: start 3487.399900, end 3803.841022
> Metadata:
> title : Chapter 11
> Chapter #2:11: start 3803.841022, end 3982.060733
> Metadata:
> title : Chapter 12
> Chapter #2:12: start 3982.060733, end 4591.919989
> Metadata:
> title : Chapter 13
> Chapter #2:13: start 4591.919989, end 4818.646489
> Metadata:
> title : Chapter 14
> Chapter #2:14: start 4818.646489, end 5397.474733
> Metadata:
> title : Chapter 15
> Chapter #2:15: start 5397.474733, end 5918.161567
> Metadata:
> title : Chapter 16
> Chapter #2:16: start 5918.161567, end 6039.491111
> Metadata:
> title : Chapter 17
> Chapter #2:17: start 6039.491111, end 6040.106000
> Metadata:
> title : Chapter 18
> Stream #2:0(eng): Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)
> Stream #2:1(eng): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
> Stream #2:2(eng): Audio: aac (LC), 48000 Hz, mono, fltp
> Stream #2:3(eng): Subtitle: subrip (default)
> Stream mapping:
> Stream #0:0 (h264) -> alphamerge (graph 0)
> Stream #1:0 (h264) -> extractplanes:default (graph 0)
> Stream #2:0 (h264) -> overlay (graph 0)
> overlay:default (graph 0) -> Stream #0:0 (mpeg4)
> Stream #0:1 -> #0:1 (ac3 (native) -> aac (native))
> Press [q] to stop, [?] for help
> Output #0, mp4, to '<path>/alphatest.mp4':
> Metadata:
> encoder : Lavf59.17.100
> Chapters:
> Chapter #0:0: start 0.000000, end 76.033611
> Metadata:
> title : Chapter 1
> Chapter #0:1: start 76.033611, end 300.000000
> Metadata:
> title : Chapter 2
> Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 23.98 fps, 14002 tbn
> Metadata:
> encoder : Lavc59.20.100 mpeg4
> Side data:
> cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
> Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
> Metadata:
> title : English Audio - <title>
> encoder : Lavc59.20.100 aac
> frame= 7193 fps= 55 q=1.0 Lsize= 463935kB time=00:05:00.01 bitrate=12668.1kbits/s speed=2.31x
> video:457767kB audio:6016kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.032624%
> [aac @ 0x55f68e9132c0] Qavg: 118.000
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